:root{--bg:#09111f;--panel:#111d2e;--line:#26364e;--text:#f5f8ff;--muted:#9cadc4;--accent:#6d5dfc}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:radial-gradient(circle at top,#172a45,#09111f 48%);color:var(--text);font-family:system-ui,-apple-system,"Noto Sans JP",sans-serif}button,input{font:inherit}[hidden]{display:none!important}button,label.imageButton{cursor:pointer}.shell{width:min(1160px,100%);margin:auto;padding:20px}.card{background:#111d2eee;border:1px solid var(--line);border-radius:20px}.welcome{max-width:520px;margin:8vh auto;padding:38px;text-align:center}.logo{font-size:58px}.eyebrow{color:#a99fff;font-size:12px;font-weight:900;letter-spacing:.14em}.muted{color:var(--muted)}.field{display:grid;gap:8px;margin:16px 0;text-align:left}input{width:100%;background:#0b1524;color:#fff;border:1px solid var(--line);border-radius:13px;padding:13px}.primary,.ghost,.imageButton{border:0;border-radius:13px;padding:12px 15px}.primary{background:var(--accent);color:#fff;font-weight:800}.ghost,.imageButton{background:#24324a;color:#fff}.big{width:100%}.welcome a{display:inline-block;margin-top:18px;color:#c9c1ff}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px}.layout{display:grid;grid-template-columns:270px 1fr;gap:16px}.usersCard{padding:16px}.users{display:grid;gap:8px;margin-top:14px}.user{display:flex;align-items:center;gap:9px;background:#0b1524;padding:9px;border-radius:12px}.dot{width:8px;height:8px;border-radius:50%;background:#536176}.dot.online{background:#39d79b}.chatCard{display:grid;grid-template-rows:1fr auto auto;overflow:hidden;min-height:72vh}.messages{padding:18px;overflow:auto;max-height:72vh}.message{display:grid;grid-template-columns:34px 1fr;gap:9px;margin-bottom:14px}.messageBody{min-width:0}.meta{font-size:12px;color:var(--muted);margin-bottom:4px}.bubble{display:inline-block;background:#19283d;border:1px solid var(--line);border-radius:7px 16px 16px;padding:10px 13px;white-space:pre-wrap;overflow-wrap:anywhere}.chatImage{display:block;max-width:min(100%,620px);max-height:65vh;border-radius:14px;border:1px solid var(--line);background:#07101d;cursor:zoom-in}.caption{margin-top:7px}.composer{display:grid;grid-template-columns:auto 1fr auto;gap:9px;padding:12px;border-top:1px solid var(--line)}.imageButton{display:grid;place-items:center}.imagePreview{position:relative;padding:12px;border-top:1px solid var(--line);background:#0b1524}.imagePreview img{max-width:180px;max-height:130px;border-radius:10px}.imagePreview button{position:absolute;top:8px;left:180px;border:0;border-radius:50%;width:30px;height:30px}.imagePreview p{margin:4px 0;color:var(--muted);font-size:12px}.modal{border:0;background:transparent;color:#fff;width:min(92vw,480px)}.modal::backdrop{background:#000c}.modalBox{position:relative;background:#111d2e;padding:26px;border:1px solid var(--line);border-radius:20px}.modalClose{position:absolute;right:12px;top:12px}.toast{position:fixed;z-index:50;top:16px;left:50%;transform:translateX(-50%);background:#fff;color:#111;padding:11px 16px;border-radius:12px}@media(max-width:760px){.shell{padding:10px}.layout{grid-template-columns:1fr}.usersCard{max-height:190px;overflow:auto}.chatCard{min-height:68vh}.messages{max-height:58vh}.welcome{margin:3vh auto;padding:26px 18px}}@media(max-width:480px){.composer{grid-template-columns:auto 1fr}.composer .primary{grid-column:1/-1}.chatImage{max-height:52vh}}